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Measurement of blood pressure in the technological age
1University Department of Medicine, Western General Hospital, Edinburgh, UK.
Abstract:
Problems with conventional blood pressure measurement using the mercury sphygmomanometer, related to both equipment and technique, are discussed. The effect of observer bias on the measuring procedure is also considered. Blood pressure variability and the phenomenon of 'white coat' hypertension are then described and their impact on the interpretation of hypertensive cardiovascular risk is emphasized. The potential role of electronic sphygmomanometers, and the use of ambulatory BP monitoring equipment, to overcome some of these problems is analysed. Technical factors both in use and interpretation of ambulatory BP data are considered, emphasizing the lack of prospective data and the difficulties in defining a 'normal' range. The current role of such equipment in both research and clinical practice is defined.
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Sites for measuring blood pressure
The Brachial Artery: Primary Site for Blood Pressure Measurement
Equipments Used To Measure Blood Pressure
This invasive approach involves cannulating a peripheral artery. During each cardiac contraction, pressure generates mechanical motion within the catheter, transmitted through rigid, fluid-filled tubing to a transducer. This transducer converts mechanical motion into electrical signals displayed as waveforms on a monitor. An automatic flushing system prevents blood backflow. Due to the potential risk of unexpected arterial blood loss, this method is primarily used in intensive...
Assessment of blood pressure in brachial artery(one-step method)
Prepare for the Procedure:
Assessment of blood pressure in brachial artery(two-step method)
Special considerations while measuring blood pressure
Monitoring Both Arms:
Monitoring BP in both arms during the initial assessment is advisable, as the systolic value may differ by five to ten mm Hg between arms. For subsequent BP assessments, use the arm with the higher reading.
Measurement of Blood Pressure

